wilson



(Mo I 2Shets--Sheet 1. dw. G. WILSON, G, S. DARLING 8?; H. WULFF.

Sewing Machine. No. 241,770. Patented May 17,1881.

ATTORNEYS.

(Model. 2 Sheets-Sheet 2.-

W. G. WILSON,.G, s. DARLING @a H.1WULPP.

y Sewingv Machine. 1 No. 241,770. Patented May 17, 1881.

Egg.

WITNBSSES ATTORNEYS.

UNITED STATESI EPATENT OFFICE.

WILLIAM G. WILSON, GEORGE S. DARLING, AND HENRY WULFF, OF CHI- CAGO, ILLINOIS, ASSIGNORS TO WILSON SEWING MACHINE COMPANY,

or SAME PLAGE.

SEWING-MACHINE.

SPECIFICATION forming part ofLetters lPatent No. 241,770, dated May 17, 1881.

` Application filed August 17, 1880. (Model.) i

To all whom it may concern:

Be 1t knownthat we, WILLIAM G. WILsoN,

GEORGE S. DARLING., and HENRY WULFF, of

, I an inverted plan view, showing the mechanism beneath the bed. Fig. 3 is a rear view of the face-plate carrying the needle-bar. Fig. et is a horizontal section of the face-plate online y y of Fig. 3. Fig. 5 is a longitudinal section 2o of the shuttle. Fig. 6 is a perspective view of ,the same. Fig. 7 is an end view of the machine, showing the hand-wheel and clutch, and

also the bobbin-winder; and Fig. 8 is a partial section of the arm, showing the mechanism for 2 5 revolving the feed-shaft and oscillating the shuttle.

Similar letters of reference indicate corresponding parts.

A is the bed; B, the arm above the bed. a 3o is the driving-shaft, carrying hand-wheel b and needle-bar crank c. (lis the needle-bar. e is the shuttle-carrier contained in case C and attached on the end of shaft f. g is the shuttle, and 7c is the feed-bar.

The needle-bar dcxtends through apertures in the face-plate af, and is carried lby the cam h, with which the crank-pin of crank c engages. The ends ot' cam ZL, as shown most clearlyin Fig. 3,move on guides h h', that are 40 formed at the inner side lof faceplate a. One

end of cam h (see Fig. 4) is fitted with a steel plate, i, which rests on the guide ZL, and with a screw, i', which bears on plate t', so that by moving the screw fi the cam is adjusted laterally with reference to the guides.

By our construction, as described, wherein the needle-bar is fitted Within the face-plate and the adjustment made by the cam, we are enabled to use a round needlcbar, which Vis 5o best and cheapest, and perfect adjustment can ibar Zr.

be made for taking up lost motion by wear or otherwise.

The casting forming the case C of the shuttlc-carrier is formed with side lugs, g', which are slotted vertically for receivingthe feed- In one lug, g', is a pin, g2, that passes through the slotted end ofthe feed-bar.

The feed-operatin g shaft Z, fitted beneath bed A, is provided with a cam, Z', beneath bar Zt, and with a second tapering cam, l2, which is at the side of an extension, 7c', from bar k, that carries a friction-roller bearing on cam l2. A

`spiral spring, m, connected to case C and har Za, serves to give the backwardand downward movements to the feed-bar and preserve the contact with the cams. The cam Z acts to lswing bar la upward on the pin 02,while cam vZ2 gives the forw ardfeed movement.

Beneaththe bed is a rod, `11.,.which is fitted parallel with shaft Z, and carries a forked arm, m', that engages with an annular slot in cam Z2. The outer bearing of rod n is provided with a `'finger-nut, n', into which a screw-threaded portion of rod n passes.

rI`he cam Z2 is held on shaftZ by a groove and feather, so that the cam may move endwise of the shaft. lBy this :construction nut/n may be turned, and rod n thus'moved endwise to move cam l2 and bring any portion of its inclined surface against the friction-roller 7c, mounted in the arm k of feedbar 7c. The length of feed-movementlis thus adjusted as required. The shaft Z is rotated by a connecting-rod, o, from an eccentric on shaft afand the shaft of the shuttledriver is rocked by connections from rod o, as shown in Fig. S, and next described.

At the inner side of arm B is xed a block,

.19, having a vertical slot in which moves a fulcrum-roller, o', of the pitman o. The roller o' is carried by a pin, q, that passes through the `hub of a short pitman, q', and through the pitman o. The-short pitman q connects with a crank-arm, f', of shaft f, and by properly proportionin g the cranks shaft f is rocked by the connections. In order to allow working as close to the crank-centers as possible without passing, and to permit adjustment for variations in length of crank f', the pin q is formed with an eccentric shoulder, p', on that portion passing through the long pitman o, :and the 10Q` pin is held from turning by a set-screw through vthe front of pitman o. By turning pin q the crank f is raised 'and lowered as may be rcquired. v

The hand-wheel b is to be driven by a belt in the usual manner.- This wheel is heldloosely on shaft a,-between arm B and a collar, bf, that is attached on the shaft. The collar b carries a clutch-arm, 1^, that binds against an inner shoulder on wheel b when the latter turns in one direction, so that the wheel and shaft turn together, but permits independent revolution of the wheel in a contrary direction.

The bobbin-Winder consists of an arm, s, hung in a box, s', that is attached on the rear of arm B, and carrying spindle t for the bobbin and roller t', that comes in Contact with wheel b when arm s is turned outward. The hinge-piu of arm s, in the box s', is provided with a spiral spring'that tends to draw the arm upward and engage the pin s2 with a slot in box s when the arm is turned outward, so that the roller is held in contact with wheel b and the arm held rigidly. To turn back the arm it is first drawn down to disengage pin s2. rlhe loose wheel b, in connection with the bobbin-Winder, placed as described, constitutes a convenient arrangement, as the bobbin can'be wound without operating the shaft a.

The shuttle g, as shown in Figs. 5 and 6, is formed with a main cavity that receives the loose bobbin u, and a smaller cavity, o, near the point, in which the tension devices ware placed.

The partition w', separatin g the two cavities, is formed with a slot, through which the thread passes from the bobbin to the tension. rlhe bobbin-cavity is f1tted with a plate, a,forming a cap or covering that sets within the rabbeted edges ofthe cavity, and is formed with a lip, u2, that extends over the thread-slot. This cap u is attached by a pin, o', around which is a spiral spring in-a cavity of the shuttle, so that the spring tends to draw the cap down to place, and also permits the cap to be drawn up and turned outward for insertion and removal of the bobbin.

The shuttle-tension devices w consist of circular disks upon an internally screw-threaded sleeve that is fitted on a screw-stud with a spiral spring beneath the lower disk, so that by turning the screw-sleeve the spring shall press the disks together with more or less tens1on.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. In a sewing-machine, the combination, with needle-bar d and face-plate a', provided with guides h', of cam h, carrying the needlebar plate t', resting on one of the guides h', and means for adjusting said plate t relatively to said guide h', substantially as described.

2. [n sewing-machines, the combination of cam h, plate z', and screw t" with needle-bar d, plate a', and guides It', substantially as and for the purposes set forth.

3. The combination, with the feed-operating shaft Z and tapering cam Z2, tted to slide thereon, ot' screw-rod a, having fork fm', and nut n', and feed-bar 7c lo', carrying the frictional roller k, substantially as and for the purposes set forth.

4. In sewing-machines, the combination,with the reciprocating pitman o of the feed-shaft, and short pitman q', that is connected with the crank of the shuttle-driving shaft, of slotted block p, and fulcrum-piu q, formed with eccentric shoulder p', and carrying roller o', substantially as and for the purposes set forth.

The above specication of our invention signed by us this 15th day of July, 1880.

W. G. WILSON. GEO. S. DARLIN G. HENRY WULFF.

Witnesses: U. D. HARPER, LUMAN ALLEN. 

